Finding the Fourth Proportional to 28,382.25, 39,168.72 and 15,807

Step by Step Solution

1. Step 1: Write the proportion equation
   28,382.25 : 39,168.72 = 15,807 : x
2. Step 2: Convert to fraction form
   28,382.25/39,168.72 = 15,807/x
3. Step 3: Cross multiply
   28,382.25x = 39,168.72 × 15,807
4. Step 4: Simplify right side
   28,382.25x = 619,139,957.04
5. Step 5: Solve for x
   x = 619,139,957.04/28,382.25
6. Step 6: Final answer
   x = 21,814.34